Synchronicity is a handy little tweak that allows the impatient to continue to use their device while it is sycning with iTunes. Everything is available as normal, with the exception of the Music app.

Synchronicity is compatible with any device with firmware 4.0 or 4.0.1. Obviously you may experience some slight lag/performance issues when this is going on, depending on what your trying to do on your phone and the device your using.

Synchronicity can be found in Cydia for $2.00.

Multifl0wiOS 4 Compatible

Once rumored to be a closed project, Mutlifl0w is back in action and ready for iOS 4. Enable exposť-like multitasking iPhone, iPad or iPod! The new release has been totally rewritten for speed, reliability, a redesigned interface, and of course, iOS4.

Multifl0w will display all currently backgrounded apps (up to 9) on the one screen, for an easy and quick control over task switching. Multifl0w has the ability to work alongside or completely replace Apple's built in task switcher inside iOS 4. Make sure you grab backgrounder along with this if you haven't already.

You can find multifl0w in Rock or Cydia for $4.99.

Resupported4iOS 4 Compatible

Resupported4 has been updated and now includes some handy new features. Resupported enables video-out with the use of almost any unsupported AV cables, usually made for iPods. Resupported4 also now adds video playback support to third-party applications, such as Hulu+, IMDB, VEVO, and more!

Resupported4 is available in Cydia or Rock and includes a 10 Day Trial.

Disable Multitasking
Exactly what it says. This tweak will allow you to disable the build in multitasking inside of iOS 4.x. A great tweak for those who need to conserve battery or launch way too many apps. Find this one free in Cydia or Rock.

iCallAnnounce
iCallAnnounce will announce (in human voice) the name of the caller you're just receiving a call from. It can also announce the full SMS details (Sender & Text) of an incoming SMS message when it arrives. Available in Rock for $1.99

CallTell
Similar to iCallAnnounce, CallTell announces who's calling you before ringing, same for text messages. Not sure the difference between the two apps but it sounds like an App War to me. This is available for $1.99 on Cydia

NoSpot
Disable the Spotlight page on the springboard. Not going to lie, I installed this as soon as I saw it. I NEVER use the spotlight. This one is free in Rock or Cydia.

WiBlaze
WiBlaze claims to be an "super fast web browser for the iDevices." Check it out, it's free on Cydia or Rock.